I have the same problem. Here are some of the sites that I am reading to learn about the fix:

http://business.baylor.edu/Richard_Easley/autofaqs/b2piston.htm

http://transmission.articles.mbz.org/b2/

http://transmission.articles.mbz.org/k1/

http://www.mercedesdismantlers.com/722.3and722.416_transmission_adjustments.html#722.3%20and%20722.416%20transmission%20adjustments

http://www.jie.com/Mercedes/mercedes_benz_transmissions.htm

https://www.adsitco.com/catalog/default.asp?CID=300

http://www.autoshoppingcenter.com/transmissions/

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz